Sand pump



Sept. 19, 1939. F. w. HEssMAN SAND PUMP Filed March 10, 1939 vnu.: M

Y f Z e w /7607 Hees/ggg? ATTOR NEYS WITNESS Patented Sept. 19, 1939 PATENT OFI-ice SAND PUMP Fred W, Hessman, Lovington, N. Mex., assigner i to C. 0. Bailer Company, Inc., a. corporation of New Mexico Application March 10,

3 Claims.

This invention relates to sand pumps and has for an object to provide a device of this character in which sticking of the piston due to accumulation of sand between the piston and pump casing will be positively prevented.

A further object is to provide a sand pump having a novel traveling valve adapted to maintain a vacuum beneath the piston during a predetermined upstroke of the piston for sucking sand and debris into the pump casing and then to be automatically released for breaking the Vacuum to permit a bottom ap valve to close and hold the sand and debris in the pump casing for removal from the well.

A further object is to provide a device of this character which will be formed of a few strong, simple and durable parts, which will be inexpensive to manufacture, and which will not easily get out of order.

With the above and other objects in View the invention consists of certain novel details of construction and combinations of parts hereinafter fully described and claimed, it being understood that various modifications may be resorted to Within the scope of the appended claims Without departing from the spirit or sacricing any of the advantages of the invention.

In the accompanying drawing forming part of this specification,

Figure 1 is a longitudinal sectional view of the lower portion of a sand pump constructed in accordance with the invention showing the piston in its lower position and the bottom flap valve closed.

Figure 2 is a cross sectional view taken on the line 2--2 of Figure 1 showing the weight for assisting gravitation of the pump piston.

Figure 3 is a fragmentary longitudinal sectional view drawn to enlarged scale and taken on the line 3-3 of Figure 1, showing the traveling valve in lowermost position and the spring pressed valve carried thereby in closed position.

Figure 4 is a bottom plan view of the traveling valve with the spring pressed valve removed.

Figure 5 is across sectional view of the travcling valve taken on the line 5-5 of Figure 3 and drawn to enlarged scale.

Figure 6 is a fragmentary longitudinal sectional view of the bottom of the pump casing, taken on the line 3 6 of Figure 1.

Referring now to the drawing `in which like characters of reference designate similar parts in the various views, I0 designates a cylindrical pump casing similar to the casing of a conventional bailer adapted to be lowered into the well 1939, Serial No. 261,072

by a cable line. The casing has a bottom shoe I I secured thereto through the medium of a bayonet joint connection I2 or other connection. A semicylindrical ap valve I3 is provided with a hinge eye I4y through which a hinge pin I5 is engaged and secured in a slot I6 in the shoe to pivotally mount the valve. A screw I1 is threaded through the s'hoe and provides a stop against which the valve rests when closed. When open the valve conforms to the cylindrical contour of the shoe so as to leave an unobstructed passage for sand and debris from the shoe into the pump casing II).

A'piston rod I8 is slidably mounted in the pump casing and comprises an exteriorly threaded cylinder I9 having a spiral series of slots 20. The upper end of the .cylinder is threaded into a Weight 2I and a rod 22 is threaded into the upper end of the Weight, the rod being equipped with an opening 23 for attaching the cable 24 which raises and lowers the piston rod in theV pump casing I0. The weight is adjustably secured to the rod and to the threaded cylinder through the medium of lock nuts 25 and 26.

A piston 21 is mounted on the piston rod and comprises a flexible rubber tube 28 which is conned between' two collars 29 and 3|] which are threaded on the exteriorly threaded cylinder I9. A lock nut 3I is threaded on the cylinder I9 and engaged against the upper collar 29 to hold the upper collar in any adjusted position in order to control the pressure of the rubber tube 28 against the inner surface of the pump casing I0.

A traveling valve 32, best shown in Figure 3, is mounted in the cylinder I9 and comprises a tubular shank 33 provided with longitudinal slots 8 and having guide flanges 34 and 35 at the top and bottom of the shank, respectively. The bottom ange is provided with a tapered surface 36 which engages a similar tapered seat 31 formed on the inner wall of the cylinder I9 when the valve is in its lowermost position.

The traveling valve carries with it as a unit a disc valve 38, which may be termed a vacuum valve since, when the valve is moved upward during upstroke of the piston the disc valve draws a vacuum throughvthe shoe to lift the flap valve I3 and permit sand and other debris to enter the pump cylinder underneath the piston, for removal from the well. The disc valve is provided with a stem 39 around which is sleeved a helical spring 40. The spring is confined under tension between an adjusting nut 4I on the upper end of the stem anda head or closure 42 formed integral with the guide flange 35 of the permit the valve controlled bottom of the cylintraveling valve. The head 42 is provided with ports 43 which communicate with the bore of the tubular shank 33 and permit the oil or water of thewell to escape through the traveling valve into the pump casing I0 as the device is lowered into the well. The valve 38 closes upwardly against a tapered seat 9, as shown and is yieldably held closed by the spring 40 until at a predetermined distance of travel of the piston 2'I the .pressure of the liquid on the upper face of the valve 38 caused by the liquid entering through the slots 20 of the cylinder I9 and slots 8 of the traveling valve and owing downward through the ports 43, opens the vacuum valve 38 to permit the vacuum to be broken when resultant closing of the ap valve I3 to hold the entrapped sand and debris in the pump casing below the piston for removal from the well when the pump casing is withdrawn from the well.

As best shown in Figure 2, the weight 2 I, forming part of the piston rod, is provided with grooves 44 which permit the liquid of the well to flow past the weight without undue restriction and thus promote effectiveness of the weight in forcing the piston to its lowest limit of movement to begin a suction stroke.

For limiting upward movement of the piston in the pump casing a ring 45 best shown in Figure 1, is xed to the inner wall of the pump casing I0 a short distance below the top thereof,

' and is disposed concentric with the casing. During upstroke of the piston the lock nut 25 on `the weight 2| will contact with the ring 45 and prevent further movement of the piston so that further pull upon the cable 24 results in lifting the pump from the well in the same manner that a conventional bailer is lifted from a well.

Since the operation of the parts has been described as the description of the parts progressed it is thought that the invention will be fully understood without further explanation.

What is claimed is:

1. A sand pump comprising a pump casing having a check valve controlled bottom, a ported hollow piston rod in the cylinder, a weight on the piston rod, a cable connected to the weight, a cylindrical rubber piston on the cylinder, means for deforming the piston laterally to engage the cylinder, a downwardly seating ported traveling valve slidably mounted in the rod, and a spring controlled upwardly seating check valve in the traveling valve adapted to normally maintain a vacuum beneath the piston during initial upstroke thereof and to be automatically opened by ilow of liquid through the ports in the rod and in the traveling valve to break the vacuum and der to entrap sand and debris in the cylinder.

2. A sand pump comprising a pump casing, a shoe on the bottom of the casing, an upwardly opening valve in the shoe, a tubular piston rod having a spiral series of ports, collars on the rod, a tubular rubber piston sleeved on the rod between the collars and conned by the collars under predetermined tension against the pump cylinder, a weight on the tubular rod, a cable attached to the weight for raising the piston to suck sand and debris beneath it into the cylinder through the open valve of the shoe during upstroke of the piston, a downwardly seating traveling valve slidably mounted in said tubular rod and having an axial bore and ports in the sides communicating with said bore, and a spring pressed upwardly seating disc valve in said traveling valve adapted to maintain a vacuum below the piston until pressure of liquid owing downward during upstroke of the piston through the ports in the piston rod and the ports in the traveling valve automatically opens the disc valve to break the vacuum and permit the valve in the shoe to close and hold the sand and debris entrapped in the pump cylinder.

3. A sand pump comprising a pump casing, a. tubular shoe on the bottom of the casing, an upwardly opening semi-cylindrical Valve pivoted in the shoe and adapted to permit sand and debris entering the cylinder without obstructionl when open, a tubular piston rod in the cylinder having ports, a collar on the bottom of the rod, a second collar threaded on the rod between said ports, a tubular rubber piston sleeved on the rod and engaged at the ends against said collar, movement of the threaded collar deforming the piston to engage the cylinder, a cable means attached to the rod for moving the rod longitudinally of the casing, a traveling valve slidably mounted inthevrod and having an axial passage and having ports in the sides communicating with the passage, an upwardly seating disc valve carried by the traveling valve and having a stem extending longitudinally of the traveling valve, a spring sleeved on the standard adapted to normally hold the disc valve closed, there being ports in the traveling valve affording communication between .the disc valve and the longitudinal passage of the traveling valve, an adjusting nut on said stem for regulating the tension of the spring,

and a stop means in the cylinder adapted to limit y upward movement of the piston longitudinally in the cylinder.

FRED W. HESSMAN. 

